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There was, indeed, a movement in their front, at the margin of the clearing. Forms appeared here and there, but the utmost quiet was observed. Suddenly the report of a gun rang out, and with a shriek, a form was seen to bound upwardly and fall, just as a shower of arrows fell against the wagon.
As the machine nears the earth it is caused to change the angle of flight by the control mechanism so that it will dart upwardly at an angle, or downwardly, and thus enable the pilot to sail to another point beyond where he may safely land. This changing the course of the machine so that it will glide upwardly, means that the incidence of the planes has been changed to a positive angle.
Such a rupture was clearly caused by an upward but oblique movement, which in the first half of the oscillation heaved the structure upwardly into the northwest, and then in the second half, or rebound, drew the mass of the building away from the unsupported corner, allowing that part of the masonry to fly off and fall to the ground.
"Do you see anything, Harry?" was George's eager questioning, as he moved upwardly. "Nothing yet," was the invariable reply. When the first limb was reached he seated himself, and had an opportunity to view the surroundings from a far better vantage point. "Can you see the river?" was the Professor's inquiry. "It is too hazy to make out anything there. It is clearer to the south."
This shows the tail E still further depressed, and the air striking its lower side, causes an upward movement of the frame at that end, which so much decreases the angle of incidence that the aeroplane darts downwardly. In order to ascend, the tail, as shown in the second diagram, is elevated so as to depress the rear end, and now the sustaining surface shoots upwardly.
Instead it assumes the position as indicated at D, and this impinging effect against the air causes the skipper to move upwardly along the line E, and having reached a certain limit, as at, say E, it automatically again changes its angle and moves downwardly along the path F, and thus continues to undulate, more or less, dependent on the combined action of the power and weight, or momentum, until it reaches the earth.
Upwardly they moved without a pause, to disappear at last over the summit. When I felt reasonably sure that they had gone for a while at least I crawled from my hiding-place and at the risk of a broken neck leaped and scrambled to the spot where their canoe was moored. If they had scaled that cliff I could, and if I couldn't I should die in the attempt.
Corallum beautifully stellular, formed by 30-35 slightly spirally-curving or regular radiating lamellae, which meet in a central point or overlap on a latitudinal axial line, and are divided by rectangular or outwardly convex and upwardly oblique dissepiments, which become, occasionally, indistinct or obsolete near the centre, thus not assuming the usual characteristic of Cyathophyllum, but rather one of Strombodes.
In climbing the body is suddenly moved toward the tree, and this motion temporarily releases the outward pressure against the hoop, and at the same moment the hoop is moved upwardly about a foot. One or both feet then make an upward step, and this process is repeated.
A TANGENT. When an object is thrown horizontally the line of flight is tangential to the earth, or at right angles to the force of gravity. Such a course in a flying machine finds less resistance than if it should be projected upwardly, or directly opposite the centripetal pull. Fig 1. Tangential Flight
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